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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A216531 Numbers n such that (10^n + 1)/11 is prime and can be written in the form a^2 + 7*b^2.

Table of values

n	a(n)
1	7
2	19
3	31
4	67
5	2137
6	268207

List of values

[7, 19, 31, 67, 2137, 268207]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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